Weft-bobbin-exchange device for looms.



A. (-1- 1105mm. WEFT BOBBIN EXCHANGE DEVICE FOR LOOMS. APPLICATION min JUNE 21. 1914.

Patented June 8, 1915.

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mrran sTATEs PATENT curios.

ALBERT GEORG KOECHLIN,

W'EBEREI STEINEN AGTIEN-GESELLSGHAET, 0F STE INEN GEBMANY.

WE FT-IBOBBIN-EXGHANGE DEVICE FOB LGQMS.

which the following 18 a full, clear, and exact specification.

In automatic weaving looms it is-already' known at each weft bobbin exchange to draw oh? and to hold ping fingers, the end of the weftthread wound about the point of the lowermost weft bobbin ready for being transferred into the shuttle, until the end of the thread is threaded into the shuttle. It has been found that it is possible that this thread end may not be caught by said fingers and the new weft "bobbin is then struck through the shuttle downward into the lower collecting receptacle for the empty spools.

Accordin tothe present invention, the drawing 0 of the thread end of the weft bobbins is also effected by means of a positively moved gripping device, but is distinguished by the fact that the vtongs-like gripper is arranged toengage'by means of wide gripping jaws over'the points of several bobbins at a time, in order to grip the thread ends of ously and to draw them oil", and in all-events, in the event of a failure of gripping the thread end of a bobbin, to attain this object by a second or even a third application of the gripper so that in consequence o the repeated possibility of grip, every security may be a orded for a correct gripping and drawing oii of the thread ends of the bobbins. The gripping jaws are preferably provided with a lining of bristles or the like which possess suiiicient adhesiveness in order to grip with certainty the thread end upon the point of the bobbin. v A special advantage may further be seen in the present invention in that also the thread ends are gripped with certainty on those spools which are not placed exactly perpendicular to the direction of feeding, but lie, from whatsoever reason, sloping to the same or otherwise depart from the normal position, consequence of the width of the gripping aws, these latter are in a position to grip the thread end with certainty, even with such abnormally placed bobbins.

' Specification of Letters Patent.

"its plan view of the improved device.

' for introducing fast by means of grip-' with a. point several bobbins simultane- The accompanying drawing illustrates an example of the invention.

-Figure 1 shows a Bldfi elevation, and Fig.

or BASEL, SWITZERLAND, Assmnoa 'ro srrnnnnnr a a I 'l atentcd June8 1915; Application am June 27,1914. ierialNa 841,010. 1

3 shows a' detail view of the-gripping jaws.

" is the inclined guides-way f the bobbins coming for example from a boxlike magazine and B is the; usual transferrer the shuttle, when a bobbin change takes place, as it is well known in apparatus of this kind. I y

Upon the fixed supporting block a, there is securedupon a pivot ban oscillating leyenc whlch is kept in the position of rest indicated in Fig. 2 n full lines by means of the action of a. spring d. At the lower end of the-lever pivot 12 is fired an arm 6 7, which on the commencement sf the bobbin exchange operation, is brought an the well known (here therefore :not -.s eoially described) manner from a {Mime ly lrioperativeposition, in which it is turned sideward, into an operative position which is that shown in the drawings and in which it lies in the path of a stop on the lay-or batten so as to be t r Wn ba k by the-lay when'the latter swings in the direction toward the point or finger f and to thus-cause an inward motion of the le- =ver a into the position indicated in dot-anddash lines in Fig. 2 to an extent limited by an adjustable stop 0.

At the front end of the lever c is placed a tongs-like gripper formed of two spring compressed gripping'jaws g, it. Of these \gripping jaws, the one 9 is fixed upon the lever 0, but the other it is'pivoted upon it and placed under the influence of a spring 2'. On the inward oscillation of the lever c, the movable gripping jaw 71. slides upon the sloping piece 70 of an opener n pivoted atm and under spring pressure, which sliding movement has for its effect that the gripper is opened in order in the open position to be thrust over the thread end is wound,

bobbin points where the and then allowed to close on them. Now, the width of the griph is so great that these jaws P s ja 9,

thepoints of three or more the lowermost bobbin into ends of the three bobbins in question are drawn off by the gripper and held fast, while the movable gripping jaw 72. can slip unhindered past the opener n, which is now pushed back and can freely yield or rock upon its pivot m. As may be seen in this arrangement, each bobbin comes with its thread portion thrice or more within the range of the gripper. If, therefore, for any reason whatever, the thread end of the bobbin w should not be gripped the first time, this will take place when the bobbin m has moved into the position of the bobbin y, on the renewed inward oscillation of the lever 0 between the gripping jaws, so that it can then be seized by these jaws, or if this should again miss, then certainly the third time, when the point of the bobbin which is moved into the place of the bobbin 2 is again attacked by the inwardly oscillating gripper g, h, so that the thread end of the bobbin will with certainty be caught and held fast and so forth. This repeated gripping of each bobbin gives the advantage that the missing of the threading-in of the shuttle in consequence of the failure to hold fast the bobbin thread end need no longer be feared, which otherwise may take place when the spool is gripped only once.

The gripping jaws g, h of the gripper are preferably provided with a lining of bristles- .in the manner best shown in Fig. 3; they might however be provided with any other suitable lining possessing suflicientadhesion to grip with certainty the thread end at the point of the bobbin.

What I claim is:

1. In weft bobbin exchange devices for looms of the kind described, a guide-way for feeding the bobbins, a transferrer for in- 4' serting the bobbins one by one into the shuttle, a movable thread end drawing-0E gripper having operative jaws relatively movable to one another, means for moving said gripper onto the bobbin points, means 4 for opening and closing the gripper jaws so as to allow them to take over the thread end wound on the bobbin points and to grip it, and means for returning the gripper to its position of rest, the gripper jaws 5 having such a form as to simultaneously grip the thread ends of several bobbins, sub stantially as and for the purpose described. 2. In weft bobbin exchange devices for looms of the kind described, a guide-way 5 for feeding the bobbins, a transferrer for inserting the bobbins one by one into the shuttle, a movable thread end drawing-off gripper having operative jaws relatively movable to one another, means for moving 6' said gripper onto the bobbin points, a yieldingly supported sloping piece for opening and closing the gripper jaws so as to allow them to take over the thread end wound on the bobbin points and to grip it, and means 6 for returning the gripper to its position of rest, the gripper jaws having sueh a form as to simultaneously grip the thread ends of several bobbins, substantially as and for the purpose described. 7l

In witness whereof I have hereunto signed my name this 16th day of June 1914, in the presence of two subscribing witnesses.

ALBERT GEORG KOECHLIN.

Witnesses ARNOLD ZEIBER, AMAND BITTER. 

